7 spheres in a formatin hovered above us, traveled at a high rate of speed,changed color

My wife and I where walking in the park. The park had tall trees. Then the sun was blocked off, like a cloud had passed over head. We looked up, because it was a clear sunny day, with no clouds. We saw large sphers over the top of us. They were blocking the sun. My wife said, go get the camera. I ran to the car to get the camera. I turned and looked up to see the sphers, which had a light gray bottom, move to the north, out over Lake Ontario. They stoped at the edge of the lake. The bottoms changed color to the same color of the lake, light blue. there were 7 of them about 200' to 300' in Dia. They were in a formation that they kept when they moved. Two in front, with 3 behind and 2 to the right side ot the formation. As I was trying to take a photo, they moved at a very very high speed straight out over the water. I would say they were no more then 150' above the water. Then the sphere that was at the right rear moved at a 90 degree angle and went East along the lake shore. They main groop went straught north out over the lake. They were moving at a very high rate of speed and was gone in a second. They made no sound and had no lights on them.
I have never reported this to anyone before. I watched the newspapers to see if anyone had reported this incounter. My wife and I decided not to say anything to any law inforcement agency as they would not beleive us. Years later I was in a book store and picked up a book on UFOs. In the book there was a photo of 7 spheres in the formation I and several other people had seen back on that 4th of July 1975